A method and device for decreasing the frequency of tracking area update (TAU) procedures triggered by cell reselections in LTE idle mode without sacrificing paging reception success rate consisting of identifying a frequency of a camped cell in LTE idle mode of a first SIM; assigning the current frequency a highest priority irrespective of the system information blocks (SIBs) broadcast by the network; and remaining on the current frequency until: a cell selection reception level value of the camped cell is less than a first predetermined threshold value or a cell selection quality value of the camped cell is less than a second predetermined threshold value.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A communication device comprising: two subscriber identity modules (SIMs); a radio frequency (RF) transmitter; and a baseband modem configured to: identify a frequency of a camped cell of a first SIM of the two SIMs; assign the frequency a highest priority; and remain on the frequency until a first of the following occurs: a cell selection reception level value of the camped cell is less than a first predetermined threshold value, a cell selection quality value of the camped cell is less than a second predetermined threshold value, or an identity of another detected cell is on an identity list that the communication device registered with the network, wherein the identity is a tracking area identity (TAI) and the identity list is a TAI list.
2. The communication device of claim 1 , wherein the RF transmitter is an only RF transmitter of the communication device.
3. The communication device of any one of claim 1 , the baseband modem further configured to identify an ongoing communication on a second SIM.
4. The communication device of claim 3 , the baseband modem further configured to conduct the ongoing communication on the single transmitter of the communication device.
5. The communication device of claim 1 , the baseband modem further configured to assign the frequency a highest priority irrespective of an information broadcasted by system information blocks (SIBs).
6. The communication device of claim 1 , wherein the first predetermined threshold value is about 5 decibels (dBS) or fewer.
7. The communication device of claim 1 , wherein the second predetermined threshold value is about 5 decibels (dBs) or fewer.
8. The communication device of claim 1 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.
9. A communication device comprising: a first SIM and a second SIM; a radio frequency unit comprising a single transmitter and a plurality of receivers; and a baseband modem configured to: identify a frequency of a camped cell of the first SIM; and during an ongoing communication for the second SIM, prevent a switch from the camped cell until: a cell selection reception level value of the camped cell is less than a first predetermined threshold value, or a cell selection quality value of the camped cell is less than a second predetermined threshold value.
10. The communication device of claim 9 , the baseband modem further configured to assign the frequency a highest priority irrespective of an information broadcasted by system information blocks (SIBs).
11. The communication device of claim 9 , wherein the first predetermined threshold value is about 5 decibels (dBS) or fewer.
12. The communication device of claim 9 , wherein the second predetermined threshold value is about 5 decibels (dBs) or fewer.
13. The communication device of claim 9 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.
14. A method for a communication device with at least one subscriber identity module (SIM) to suppress a cell reselection on a first SIM, comprising: identifying a frequency of a cell on which the first SIM is camped on; assigning the frequency a highest priority; and remaining on the frequency until a first of the following occurs: a cell selection reception level value of the cell is less than a first predetermined threshold value, a cell selection quality value of the cell is less than a second predetermined threshold value, or an identity of another detected cell is on an identity list that the communication device registered with the network, wherein the identity is a tracking area identity (TAI) and the identity list is a TAI list.
15. The method of claim 14 , wherein the communication device comprises a radio frequency (RF) unit with a single transmitter.
16. The method of claim 14 , further comprising an ongoing communication on a second SIM of the communication device.
17. The method of claim 16 , further comprising the ongoing communication utilizing the single transmitter of the communication device.
18. The method of claim 16 , further comprising wherein the ongoing communication is a voice call.
19. The method of claim 14 , further comprising assigning the frequency the highest priority irrespective of an information broadcasted by system information blocks (SIBs).
20. The method of claim 14 , further comprising wherein the first SIM is in an idle mode on the frequency.
21. The method of claim 14 , further comprising wherein the cell reselection comprises a tracking area (TA) cell reselection.
22. The method of claim 21 , wherein the TA cell reselection triggers a TA update (TAU).
23. The method of claim 14 , wherein the first predetermined threshold value and the second predetermined threshold value are the same value.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
April 1, 2016
August 21, 2018
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